Results 31 to 40 of about 132,108 (75)
Morphology of Seyfert Galaxies [PDF]
, 2017 We probed the relation between properties of Seyfert nuclei and morphology of their host galaxies. We selected Seyfert galaxies from the Sloan Digital Sky Survey with redshifts less 0.2 identified by the V\'{e}ron Catalog (13th). We used the "{\it{FracDev}}" parameter from SDSS galaxy fitting models to represent the bulge fractions of the Seyfert host ...
arxiv +1 more source
A Radio Polarimetric Study to Disentangle AGN Activity and Star-Formation in Seyfert Galaxies [PDF]
, 2020 To understand the origin of radio emission in radio-quiet AGN and differentiate between the contributions from star formation, AGN accretion, and jets, we have observed a nearby sample of Seyfert galaxies along with a comparison sample of starburst galaxies using the EVLA in full-polarization mode in the B-array configuration. The radio morphologies of
arxiv +1 more source
A Comparison of Radio Axis with Host Galaxy Plane Axis in Seyfert Galaxies [PDF]
, 1996 We use the radio axis as an indicator of the orientation of the obscuring torus in Seyfert galaxies, and analyze the difference between the position angles of extended radio structures and host galaxy major axis of Seyfert 1 and Seyfert 2 galaxies. We find that Seyfert 1's are less likely to have extended radio structures along the host galaxy major ...
arxiv +1 more source
Reflection in Seyfert Galaxies and the Unified Model of AGN [PDF]
, 2011 We present a deep study of the average hard X-ray spectra of Seyfert galaxies. We analyzed all public INTEGRAL IBIS/ISGRI data available on all the 165 Seyfert galaxies detected at z<0.2. Our final sample consists of 44 Seyfert 1's, 29 Seyfert 1.5's, 78 Seyfert 2's, and 14 Narrow Line Seyfert 1's.
arxiv +1 more source
The Astrophysical Journal, 2023 Some Seyfert galaxies are detected in high-energy gamma rays, but the mechanism and site of gamma-ray emission are unknown. Also, the origins of the cosmic high-energy neutrino and MeV gamma-ray backgrounds have been veiled in mystery since their ...
Hiromichi Tagawa +2 more
doaj +1 more source
The Unified model and the Seyfert 2 infrared dichotomy [PDF]
Mon.Not.Roy.Astron.Soc. 320 (2001) L15, 2000 An optical spectropolarimetric study has shown that the detectability of polarised broad H-alpha in Seyfert 2 galaxies is correlated to the IRAS f60/f25 flux ratio where only those Seyfert 2s with "warm" IRAS colours show polarised broad line emission.
arxiv +1 more source
The Astrophysical JournalWe analyze a sample of ~113,000 galaxies ( z
Huynh Anh N. Le, Yongquan Xue
doaj +1 more source
The difference between the narrow line region of Seyfert 1 and Seyfert 2 galaxies [PDF]
, 1998 This paper presents a comparative study of emission line ratios of the Narrow Line Region (NLR) of Seyfert 1 and Seyfert 2 galaxies. It includes a literature compilation of the emission line fluxes [OII]3727A, [NeIII]3869A, [OIII]5007A and [NeV]3426A, as well as 60mum continuum flux, for a sample of 52 Seyfert 1's and 68 Seyfert 2's.
arxiv +1 more source
The Seyfert Population in the Local Universe [PDF]
Astron.J.126:1750,2003, 2003 The magnitude-limited catalog of the Southern Sky Redshift Survey (SSRS2), is used to characterize the properties of galaxies hosting Active Galactic Nuclei. Using emission-line ratios, we identify a total of 162 (3%) Seyfert galaxies out of the parent sample with 5399 galaxies. The sample contains 121 Seyfert 2 galaxies and 41 Seyfert 1.
arxiv +1 more source
Revisiting the Fraction of Radio-Loud Narrow Line Seyfert 1 Galaxies with LoTSS DR1
Universe, 2020 Radio-Loud narrow-line Seyfert 1 galaxies (NLS1s), especially the extremely radio-loud ones, are widely accepted as the jetted versions of NLS1s. We explore the radio-loud fraction for NLS1s with recently released LoTSS DR1 at 150 MHz.
Xu-Liang Fan
doaj +1 more source